# Revision history [back]

### The meaning of arguments of is_primitive

Say we have

R.<x> = PolynomialRing( GF(5) )
f = x^2 + 2*x +3


then we can use f.is_primitive() to tell if f is primitive. But is_primitive has two argument n and n_prime_divs. The document say

"n" (default: "None") - if provided, should equal q-1 where
"self.parent()" is the field with q elements;  otherwise it
will be computed.


But this is whose 'self'? Is it the self of polynomial f? so n=4? I think here the n shall be 5^2-1. The following code will result in error.

f.is_primitive(4, [2])


but

f.is_primitive(5^2-1, prime_divisors(5^2-1))